I wrote the test yesterday. Am quite happy with my score. 730! Yippee!
I'll be posting a de-brief soon, but I just thought I'd share this piece of info with future test takers.
I didn't find anything in the actual GMAT that was different from the GMAT Preps I had taken a while ago. As usual, there were some sneaky questions thrown in here and there to catch me off guard, but it was ok! I got 3 questions where they tested me on incorrect usage of idioms. (I'm guessing these are the residual idiom questions in the question pool??) Plus, there were some 2-3 questions in SC where I wasn't able to find anything gramatically wrong in 2 choices. Thank heavens I was able to spot a minor deviation from the original meaning in one of those choices at the last moment. :-p
All in all, I agree with the expert opinions posted above, and wouldn't worry too much about the pattern change. It was a fun exam, and I loved the elegant twists in the questions...Peepuls who are taking the test in the near future can even expect the same number of idiom questions as they would have faced previously.
Cheers!